Tacker



Nov. 11, 1952 F. s. BOROU-GHS TACKER 4 Sheets-Sheet 1 Filed Aug. 6, 1948FIG.E

INVENTOR.

FRANK 5. BOROUGHS m m mi wmww 3 4 1 :LIt

@Mwy whwlm My ma 2 m FIGS Nov. 11, 1952 F. s. BOROUGHS 2,617,096

TACKER Filed Aug. 6, 1948 4 Sheets-Sheet 2 I um"nlmunmmlummmm 5 JP 2 a)0/ 6.9..

INVENTOR,

FRANK & BOROUGHS Nov 11, 1952 F. s. BOROUGHS TACKER 4 Sheets-Sheet 3Filed Aug. 6, 1948 INVEN TOR.

FRANK S. BOROUGHS A T TOR/V5 Y Nov. 11, 1952 F. s. BOROUGHS TACKER 4Sheets-Sheet 4 Filed Aug. 6, 1948 INVENTOR.

MAN

NW hb mm NAQQQQ FRANK S. BOROUGHS ATTORNEY Patented Nov. 11, 1952 TACKERFrank S. Boroughs, New York, N. Y., assignor to Arrow Fastener, Inc.,Brooklyn, N. Y., a corporation of New York Application August 6, 1948,Serial No. 42,760

This invention relates to hand actuable staple tackers. An object ofthis invention is to provide a device of the character described whichshall have considerable power with relatively little movement of thehandle, and which shall be comfortable to operate without tiring thehand.

Another object of this invention is to provide a device of the characterdescribed comprising a body, a staple magazine hinged at one end to thebody and held in place on the body by a removable element and a frontcover or nose likewise pivoted at one end to the body and held in placeon the body by said element, whereby removal of said element will permitboth the magazine and the nose to swing away from the body for cleaningor servicing the device.

Another object of this invention is to provide in a device of thecharacter described, a staple pusher spring lock, means for retainingthe staple pusher in place, said lock means being controlled by ahandle, and the staple magazine being so arranged that when it is swungaway from the body, it will automatically release the lock for thepusher.

Yet another object of this invention is to provide a device of thecharacter described, a body, a handle pivoted to the body, a pawlpivoted to the handle, a trigger pivoted within the body and beingconnected to a spring pressed plunger, the arrangement being such thatas the handle is pressed towards the body, the pawl on the handle willrotate the trigger to lift the plunger, and when the plunger is lifted apredetermined distance, the pawl will snap 01f the trigger to permit theplunger to be forced down for ejecting a staple, said trigger havingmeans to prevent backing up of the plunger and'being further pro- .videdwith means to shove the pawl off the trigger should the pawl stick forany reason.

ders on the trigger, and the trigger arms having engagement with twopairs of detents on the plunger whereby to provide for more balancedoperation and longer wear.

A still further object of this invention is to provide in a device ofthe character described. a

' invention.

26 Claims. (Cl. 1-4-9) trigger having shoulders and a pawl pivoted tohandle and having engagement with the trigger shoulders, the shape ofthe shoulders and the pawl being such as to release abruptly when thehandle is depressed to a predetermined position.

A still further object of this invention is to provide a tacker of thecharacter described comprising a casing having side walls recessedoutlwardly to give clearance for the detents on the plunger plug andalso to give clearance for the trigger arms, which engage between thedetents.

Still another object of this invention is to provide a strong, rugged,durable and compact hand staple tacker of the character described, whichshall be relatively inexpensive to manufacture, easy to assemble andmanipulate and which shall yet be practical and eflicient to a highdegree in use.

Other objects of this invention will in part be obvious and in-parthereinafter pointed out.

The invention accordingly consists in the features of construction,combinations of elements, and arrangement of parts, which will beexemplified in the construction hereinafter described, and of which thescope of invention will be indicated in the following claims:

In the accompanying drawings in which are shown various illustrativeembodiments of this Fig. 1 is 'a side elevational view of a deviceembodying the invention;

Fig. 2 is a cross sectional view taken on line 2-2 of Fig. 3:

Fig. 3 is a vertical, longitudinal cross sectional view, taken throughthe middle of device shown in Fig. l. I

Fig. 4 is a cross sectional view, taken on line -i4 of Fig. 3;

Fig. 5 is a cross sectional view, taken on line 5--5 of Fig. 3;

Fig. 6 is a view similar to Fig. 3 but showing the handle depressed andin a position just before the pawl snaps 01f the shoulders on thetrigger;

Fig. '7 is a cross sectional view, taken on line 'l! of Fig. 6;

Fig. 8 is a partial vertical cross sectional view of the device andshowing the staple pusher lock released and in retracted position;

Fig. 9 is a cross sectional view, taken on line 99 of Fig. 6.

Fig. 10 is a longitudinal vertical cross-sectional view of the staplershowing the front cover swung forwardly and the stapler magazine swungdownwardly and with the staple pusher removed;

versely curved walls 2| having meeting edges 2Ia in a verticallongitudinal plane bisecting the body; The wall 2| extending from eachside wall is formed with a forwardly and upwardly curved extension 22and a rearwardly and downwardly curved extension 23. The upper ends ofwalls 22 extend to the upper edges 24 of the side walls 20.

Said casing H is formed with a horizontal longitudinal through handOpening 25 (Fig. 6). The side walls 28 are interconnected by top andbottom walls 26 and 21 and end walls 28 and 29,

forming a top, bottom and ends. of the hand hold 25', said. end walls28? and 29 are: semi-circular andinterconnectr. the ends of walls'ifiiand 21-. The walls 26, 21, 28 and 29' are of: curvedtransverse.crossesection. Therside-walls Zdhave parallel loweredges' 31.disposed .in the same. horizontal plane. Saidcasing is open at thebottom. Itis also open at its frontiendand its upper end forwardly ofwall 22.. The rear, lower edges of walls. E3tterminate. substantially inthe horizontal plane oftthe-axes for the'curved end walls- 2% and 29. asindicated at 32;.and': hence the casing E! is: also open. at itsrear'end,.below said edge 32.

The sidewalls 26 are formed attheir front endswithvertical forward edges33 (Fig. 1) extending upwardly from theforward ends of the loweredges31-. The edges 33 extend up to a level somewhat below the level of ahorizontal plane. passing through. the axes. for the curved end walls28and 29; Extending from the upper endsof edges 33- a short distancerearwardly therefrom, are horizontal edges 34. The said side walls 28are'formed with outwardly recessed flat parallel U-shaped portions 35above and rearwardlyof the edges 34. Said portions 35 have forwardvertical edges 35 extending upwardly from the rear ends of edges 34.Said portions 35 have parallel upper and lower ends 31 and 38,respectively, and a rear curved portion 39 interconnecting said portions31 and 38; The portions 3?, 38', and 39 interconnect the outwardlyrecessed areas or portions 35 with the main portions'of wall 20.Extending forwardly from the upper ends of the vertical'edges 36 of saidportions 35, are edges 40, from the front ends of which extend upwardlyvertical edges ii merging with the top horizontal edges 2 by means ofcurved edges 42.

Said side walls 28 are furthermoreformed adjacent the front edges 33 andabove the lower edges 23 with aligned horizontal slotsdii disposed at asomewhat higher level than the inwardly grooved'portions 44E Said sidewalls 29 are furthermore' formed, just above the portions 3?, thereofand adjacent the edges 4i thereof with aligned horizontal slots 46, forthe purpose hereinafter appearing. The slots 46 are in verticalalignment with the slots 45.

Said side walls 26 are furthermore formed, somewhat rearwardly of thewalls 2'5, with aligned punched openings i8 (Fig. l), for the purposehereinafter appearing. Said side walls 20 are also formed just below theedge 32 with notches 39. (Fig; 8), for the purposehe'reinafterappearing. Said side-walls 28 are: furthermore formed somewhat above theslots 46 with aligned round openings 50 (Fig. 6), for the purposehereinafter appearing.

The portions 35 of walls 20 are furthermore formed with aligned openings5! centered with respect to the curved portions 39. Said side walls arefurthermore formed, somewhat above and rearwardly spaced with respectto. the slots 45, with alignedthrough openings s2 (Fig. 6), for thepurpose hereinafter appearing. Said side walls are also formed, abovethe rear end of portions 35, with outwardly pressed portions 54 havinghorizontal upper edges 55. The upper edgesiEB are located somewhat belowthe centers of the openings 58-.

Below thenotches d9 (Fig. 8), the rear ends of said walls 26 have edges56 which extend upwardly from the rear ends of the lower edges 3i. Theedges 56 are somewhat inclined forwardly and upwardly at their upperends as at 56a.

Mountedon andbetween the saidwalls 2% is a lower spacer: 6i) (Figs; 5and-9) Said spacer. B0 ishorizon'tal: and comprises a plate having atitsopposite edges, extensions 6! terminating short of: the front and rear.edges of the spacer. and pro ecting intothe slots 45,. thereby formingshoulders contacting the inner surfaces ofwalls 25- at opposite sides ofsaid slots.- At the-front edge of spacer Ellis a longitudinalgroove 62,for the purposehereinafter appearing. Said.- spacer plate'tuis formedwith-a central opening (53.

Mounted on and between said side walls 213 is an upper spacer 85- (Figs.2 and 5) Said upper spacer is horizontal: and isprovided at the sideshereof with projectionsv 65 extending. into slots 26 thereby formingshoulders atthe endsof said slots engaging the inner surfaces of. thewalls 2-8. Saidupper spacer. 85 is formed with a centralopening 6i andwith a downward pro.- jecting annular flange 88 (Fig. 9). surroundingsaid opening.

Mounted on the front of the casing H. is a front cover. if) (Fig 10).Said front cover- 10 comprises a front wall H, from which there.ex.-tendside walls 12. The front wall H. iS.fOll'I1Bd with av verticalforwardly recessed portion 13 spaced from the sidewallslZ and spacedfrom the lower edge 14 of wall H. The side walls 12 have lower end edgesl5.flush withtlie lower end edges 3i of the. side walls. 211'. Extendingupwardly fromthe rear ends of the edges 15 are vertical edges is inalignment with the axes of the openings 52.v Extending from the edges 15are. seniiecircular. edges. Ti concentric with the axes of the openings52. Extending forwardly from the upper. ends. of the semi-circular edgesH. are. horizontal edges 18. terminating. at. the

rear. ends. of the edges 34- of. the side walls220. Extending upwardlyfrom the forward ends of edges i8 are vertical edges '19 terminating atthe forward ends of portions 31 of the side walls 20. Extendingrearwardly from the upper. ends. of the edges] 9' are. horizontal edgeportions. 83 from which extend upwardly and rearwardly curved edgeportions 8|. The edge 8! makes substantially three-quarters of a circleterminating at the'front wall 72. There are thereby formed ears 82 atthe upper ends of the'said walls '12. The upper end of the: front wall His inclined upwardly and rearwardly as at 83 at its upper end, extendingto a point somewhat above the axes ofthe ears 82-. Said ears 82 areformed with through openings 82a registering with. theopenings 55in. theside walls 20. The side walls 12 of the front cover are also formedwith. openings side walls 20.

registering with the openings 52 in the side walls 20.

Y Extending through openings 52 in the side walls and the openings inthe side wall I2 registering therewith, is a removable screw 85 having ahead at one end and a reduced threaded portion at the opposite endreceiving a nut 85. The screw 85 may be removed to permit the frontcover to be swung upwardly and forwardly as will appear hereinafter.Extending through the openings in the side wall 20 and the openings 82ain the ears 82 registering therewith, is a screw 81 having a head at oneend and having reduced threaded portion at the opposite end receiving anut 88.

' It will now be understood that the front cover I0 is entirelyremovable and that also when the screw 05 is removed, the front covercan swing forwardly and upwardly about the screw 81 to permit servicingof the tacker.

Mounted on top of the lower spacer (Fig. 9) is a soft compressiblegasket or shock absorber -89 in the form of a disc made of rubber orrubber-like material, and the latter may be attached to the spacer bymeans of a rivet 89a passing through the hole or central opening 63'.

Between the lower ends of the said walls 20 of the casing is a staplemagazine 90 (Fig. 10). Said magazine 90 comprises generally of amagazine frame BI and a magazine rail 92 (Fig. 7). The frame 9Icomprises a bottom wall 93 from which extends upwardly side walls 94fitting within the side walls 20 of the casing. The bottom wall 93terminates as at 93a in an edge short of the for- .ward edges of theside walls 94. Extending inwardly from the upper ends of said side walls94 are horizontally aligned flanges 95 projecting toward each other.Said flanges 95 terminate somewhat rearwardly of the front ends of theside walls 94, the latter being flush with the front end edges 33 of theside walls 20 of the casing, and forming with the front wall II of thefront cover a slot 96 (Fig. 6) registering with the slot or groove 02 inthe lower spacer B0 to receive a iplunger blade 91 to be described indetail hereinafter. Extending upwardly from the inner ends of theflanges 95 at points spaced rearwardly of the forward ends of saidflanges are upwardly extending parallel vertical walls 98 formed attheir upper ends with outwardly extending horizontal flanges 99 (Fig.'7) from the outer ends of which extend upwardly vertical walls I00. Theupper edges of the walls I00 are -substantially at the level of portions38 of the Extending inwardly from the for- -ward ends of walls I00 arevertical flanges IOI '(Fig. 6),'which project toward eachother and arelocated in a plane perpendicular to the side :walls 20 and spacedrearward-1y from the front walls of the front cover I0.

The walls I00 are formed with aligned openings registering with theopenings 52 and through which the screw 85 passes. It will be noted thatthe forward ends of the side walls 94 of the magazine frame extenddownwardly to the level of the undersurface of the bottom wall 93forwardly of the forward edge 93a of said bottom wall, said side wallsbeing notched at their lower edges just forwardly of said edge 93a.

Extending upwardly from the rear ends of the flanges 95 (Figs. 10 and11) are vertical walls I02 from which extend outwardly horizontalshoulders I03 and extending from the outer ends of the shoulders I03 areupwardly extending ears I04 formed with aligned openings registering ofthe spring I25 contacts the pusher H3.

6 with the opengs 48 in the side walls 20. Extending through saidopenings 48 and through the openings in the ears I04 registeringtherewith is a horizontal pivot I05. -It will now be understood thatwhen the screw is removed, not only can the front cover be swungforwardly and upwardly, but the staple magazine may be swung downwardlyand rearwardly, to permit servicing of the tacker.

The magazine rail 92 (Fig. 7) comprises a horizontal top wall I05 fromwhich extend downwardly side walls I07. The walls I06 are spaced belowthe flanges 95, and the walls I0I are spaced inwardly of the side walls94, providing space for the staples I08 which slide on the rail 92 andbetween said rail and the frame 9|. Punched from'the top wall I 05 aredownwardly pressed tongues I09 (Fig. 6) welded to the bottom wall 03 asat H0. The forward end of the top wall I 06 is flush with the forwardends of the top flanges so as to permit the plunger blade 91 to pressthe foremost staple I00 downwardly.

Mounted on the rail 92 is a staple pusher II2 of usual construction andincluding a member II3 slidable on said rail and having upwardlyextending apertured ears H4 through which passes a pusher rod I I5. Theforward end of rod H5 is upset or enlarged in the usual manner so thatthe pusher will not come off said forward end. Fixed to the rear end ofthe rod II 5 is a member IIS having a rear wall III disposed between therear ends of the side walls 20. The wall H1 is flush with the rear edges56. The rear end of the rod I I5 is riveted thereto.

Extending from the sides of rear wall II! are side walls II 0 whichfitbetween the side walls 20 and include upwardly extending apertured earsIIO carrying a transverse pivot pin I20. Pivoted to the pivot pin I20 isa pusher lock I2I. Said pusher lock I2I comprises a rear wall I22located between the upper end of wall I" and the lower edge 32 of easingwall 23'.

Extending from the sides of wall I22 are parallel wings I23 which fitinto the notches 49. Extending from the sides of rear wall I22 areparallel walls I24 formed with openings through which pivot pin I20passes. At the forward ends of the side walls I24 are hooks I 25 adaptedto snap into engagement with pivot I05-when1 the mem:

ber H0 is pushed forwardly to locking position. On the bar H5 is a coilcompression spring I26 contacting at its rear end an extension I21 atthelower end of rear wall I22. The forward end The extension I21straddles the rod H5 and is notched for such purpose.- The spring I26thus has two functions: it serves to push the pusher member II3forwardly for advancing the. staple strip; and it also serves to rotatethe lock member I2I in a counterclockwise direction toengage hooks I25with the pivot pin I05 for locking the pusher in place.

In order to remove the pusher, the wings I23 are engaged by the fingersof the operator and member I2I is rotated in a clockwise directionthereby releasing the hooks I25 from the pivot pin I05 and permittingthe entire pusher assembly to be slidably moved rearwardly so that a newstaple strip may be slipped onto the rail 92. It will now be furtherunderstood that should the screw 85 be removed and the staple magazineswung downwardly and rearwardly, the rear end of the staple magazinewill move upwardly. This upward movement causes wings I23 to slideupwardly in the lateral notches 49, at the same Z timeurgingpusherlock:I21; in a clockwise: direction about its. pivot pin, I thusraising hooksI from locking; engagement with thestaple magazinepivot pin- I05. Uponrelease of pusher lock I'2I, the entire assembly, comprising members. H6and I2 I, is urged outwardly to the right by the action of the pushercompression spring I25,.thus clearing the way for the continued furtherupward movement of the rear end of. the staple magazine frame 9|, as themagazine completes its downward and rearward swinging movement aboutitspivot pin I05.

Slidably mounted within the casing Ii and between the sidewallsthereof', adjacent the front cover10', is a plunger I30. Theplunger I compri'scsaframe I31" which maybe made of a single piece ofmetal. Said frame I3I comprises a-bottom wall I132 which may be convexupwardly. Extending from the bottom wall I32 isv a vertical front. wallI33, a vertical rear wall I34 parallel to the front wall, and verticalside walls I35 parallel to one another and forming a chamber to receive.the lower end-of a coil compression spring I36 interposed between thebottom wall I32 and the; upper step on spacer member-45. Theannular'flange 58. of the upper spacer centers the upper end of thespring I35. The coil compression spring: I38 tends to depress theplunger frame I3I; The plunger blade or driver 91 is'riveted to thefront wallv I33" as' at I31 and projects downwardly therefrom contactingthe inner surface of the front wall 'iI and passing through groove Standgroove 82 inthe lower spacer, for driving the foremost. staple in thestaple strip. Theforwardly recessed portion 13 of the front cover. 1|provides the space necessary for the head of the rivet I31. As theplunger descends, the rear Wall I34 will be engaged by the verticalflanges I OI of walls. I55 of the staple magazine which serve as' aguide for the plunger. As will be seen hereinafter, the plunger descendsunder the impact of a released previously compressed spring I36, and thelower wall I32 of the plunger frame will contact the shock absorber 89'which serves to absorbtheshock of the blow.

'I'hefront Wall I33 of plunger I39 (Figs. 3 and 6). may be formed with apair of forwardly pressed prongs I40 punched from said front wall, toengage the front wall 1! of the cover for guiding the plunger'as itmoves up and down.

The rear wall I34 may be formed with a through opening I44 aligned witha rivet opening in the front wall I33 to facilitate application of therivet I31 whichrivets the plunger blade or driver 91 to said front wall.

It Will be noted that the front wall I33 extends abovethe upper ends ofthe side and rear walls I35 and I34 and the extended portion of saidfront wall 233 is formed with a boss I45 contactingfthe inner. surfaceof the front wall 1 I.

The side walls I35 of the plunger frame I 3I are each formed with a pairof symmetrical outwardly pressed. or punched detents or lugs I and I51having inner inclined edges. The inner inclined edge of the upper detentI is inclined upwardly and rearwardly to an angle of about 15 to' thehorizontal, whereas the inner edge of the. lower detent E5l is inclineddownwardly and rearwardly to. an angle of about 15 to the horizontal.The purpose of these detents or lugs will be described-hereinafter.

Extending through the openings 5I in the portions 35 of the side walls20 is ahorizontaltransverse pivot I53. Pivoted thereto is a trigger I54.Said trigger I54 comprises abottom web or. wall I55. Extending forwardlyand. upwardly; from the forward end of web I55 is a curved tongue I56adapted to contact the rear surfaceof rear wall I3 3. Extending upwardlyfrom the rearend of web I55 is astraight wall or tongue I51 disposed atright angles to the wall I55 for the purpose hereinafter appearing.Extending upwardly from the sides of the web- I55 are parallel sidewalls or arms I58 having aligned openings registering with the openings5I and through which the pivot I5:3= passes. The curvedtongue: I56 isconcentric with the axis of the rivet I53so that as the trigger I54 isrotated, the curved tongue I56 will remain in contact with wall I34of'the plunger. The arms I58 straddle the plunger frame and contact theouter surfacesof the :side walls I35. At the forwardendsofsaidarms. I58are heads I59 each shaped like a geartooth and engaging-between. theinner edges of the; detents or lugs I59, I5I. Thus as the, trigger I54:isrotated in a clockwise'direction in the manner hereinafter appearing,the heads I59 engaging the detents I55 will raise the plunger.- At a.predetermined point. in the lifting movement'or operation of theplunger, the trigger is-released, in a manner to be describedhereinafter, and the compressed spring I35-will cause the plunger. todescend with force, to drive a staple lllll'for a tacking operation. Atthe rear. ends of arms I58 and projecting beyond the wall or tongue I51:are curved lugs or shoulders I66, for the: purpose hereinafterappearing.

(3n the screw 31 is a spacer bushing 81a- Piv oted on screw 81 isahandle I6I. Said handle comprises a top wall I52 the rear. end of whichis curved downwardly as at I63. At the forward end of the top wall IE2is a downwardly and forwardly inclined wall I54 having a front edge I65,adapted to contact the upper edge I56 of the upper end portion 83 of thefront wall 11 of the cover when the handle is not pressed towards thecasing II. Extending from the topwall portions I62, I53 are parallelside walls or flanges I56. The handle is open at the bottom and at itsforward end IE5. At the forward end of the handle are side wall portionsI61 pressedoutwardly and straddling the ears 82 of the front cover. Atthe forward ends of the side walls I61 are substantially semi-circularportions I58 formed with central openings registering with the openings55 and with the openings 82a in the ears 82 and through which the screw81'passes.

The bushing 810: (Fig. 9) passes through the 0penings'50 in the sidewalls 20 and serves as a spacer for the ears 82. The ends of the bushingcontact the inner surfaces of said ears 82' of the front cover 19.The-side wallsv I66 andside wall portions I61 have lower edges I10,adapted to contact the upper edges 55 of 'the lugs 54 of the side walls29, when the handle isdepressed, to limit swinging movement of thehandle in clockwise direction, that is, from the full line to thedot-dash line position of Fig. 1. When-the edges I15 contact the lugs 54said edges I10-will be substantially in a horizontal position, As thehandle is depressed, edge I65 will move away from edge I56 as shown inFig. 6 of the drawings.

Disposed about the bushing 81a is a handlev return torsion spring I12;One end I13of the spring contacts the underside of the top wall portionIE4 of the handle, whereas another end I14 of the spring contacts therear edge of the upper spacer 55. The torsion spring I12 tends to liftthe hand1e and said spring is tensioned when the handle is depressed.

Fixed to the underside of wall I62 of the handle is a pawl bracket I76.Said pawl bracket has top aligned top wall portions Ill and I18contacting the underside of said wall lt2. interconnecting said Wallportions Ill and I78 are side wall portions IlS disposed within andspaced from the side walls I55. I'he walls I19 are formed with alignedopenings 89 receiving a transverse horizontal pivot I81 spaced below thewall I82. Wall I'II may be riveted to the wall I52 by means of a rivetISI. The said walls IIllmay be formed with slots I82 to straddle thewalls 22 of the casing Ii when the handle is depressed. Pivoted to therivet IN is the pawl member I85. Said pawl member I85 comp-rises a topwall from which extend downwardly parallel pawls I87. Said pawls I87 areformed, somewhat below the top wall I85, with openings registering withthe openings I80 and through which the pivot pin I8I passes. The pawlmember is thus pivoted on the pivot pin I8I and may move relative to thehandle ISI. Thetop wall I86 of the pawl member is located between thetop wall portions Ill and H8 of the pawl bracket I76. On the pivot pinIBI is a coil torsion spring I88 which tends to rotate the pawl I85 in aclockwise direction relative to the handle, looking at Fig. 3 of thedrawings. The torsion spring I88 has one end i983 which contacts theunderside of the top wall I86 of said pawl I85. The other end I9I of thetorsion Spring contacts the underside of the top wall Ill of the pawlbracket. The lower ends of the pawls i8? engage the curved shoulderextensions or lugs I60 of the trigger.

When the handle is depressed from the position shown in Fig. 3 to theposition shown in Fig. 6, the trigger is rotated in a clockwisedirection raising the plunger and loading the spring I36. At the sametime the pawl member I85 will be turned in a counterclockwise directionrelative to the handle. When the plunger is fully raised to apredetermined position, the lower ends of the pawl will snap oif theshoulders or lugs I68, permitting the loaded spring I36 to depress theplunger and drive a staple.

When the handle is released and swings up- Wardly in a counterclockwisedirection relative to the casing, the pawl member I85 under theinfluence of the torsion spring I88 will be moved back to normalposition so that the pawls I87 again engage shoulders I60. Should thepawl fail to snap off the lugs I60 when the plunger is fully raised to apredetermined position,-the upper end of wall ortongue I51 will pushthepawls oif said lugs at the proper point in the rotation of the trigger,thus serving as a safety factor to insure release of the plunger at theproper point.

It will thus be seen that there is provided a device in which theseveral objects of thisinvention are achieved and which is well adaptedto meet theconditions of practical use.

As various possible embodiments might be made, of the above invention,and asvarious changes might be made in the embodiment above set forth,it is to be understood that all matter herein set forth or showninthe'acco'mpanying drawings is to be interpreted as illustrative andnot in a limiting sense.'

Having thus described my invention I claim as new and. desire'to protectby Letters Patent of the United States; I

1, In astaple taoker, a body, a handle pivoted to the body, a, staplemagazine within the body,, a plunger slidably mountedwithin thebody, a

driver blade fixed to the plunger slidable there-- with and adapted todrive staples from the staple magazine when the plunger descends, atrigger pivoted mediately the ends thereof to the body on a pivotdisposed below the handle, means on the front end of the triggerengaging the plunger for lifting the latter, spring means to press theplunger downwardly, a pawl movable with the handle disposed rearwardlyof the pivotal connection between the handle and the body and projectingdownwardly therefrom, the lower end of the pawl releasably engaging therear end of the trigger, whereby when the handle is pressed downwardlytoward the body the pawl will rotate the trigger about its pivotal axisto raise the plunger, said trigger being swingable to an angle where thepawl slides rearwardly off the rear end of the trigger and disengagesitself from the trigger to release the latter during said downwardmovement of the handle toward the body, and means on the trigger to pushthe pawl off the trigger should the pawl fail to slide off the trigger.

2. In a staple tacker, a body, a handle pivoted to the body, a staplemagazine within the bottom of the body, a plunger slidably mountedwithin the front end of the body, a driver blade fixed to the plunger,slidable therewith and adapted to drive staples from the staple magazinewhen the plunger descends, a trigger pivoted mediately the ends thereofto the body on a pivot disposed below the handle, means on the front endof the trigger for raising the plunger, spring means to press theplunger downwardly, a pawl movable with the handle and projectingdownwardly therefrom, the lower end of the pawl releasably engaging therear end of the trigger for pivotally moving the trigger about its axisto raise the plunger when the handle is rotated toward the body, andmeans on the trigger to push the pawl oiT the rear end of the triggerwhen the trigger reaches a predetermined angle as it is swung about itsaxis.

trigger pivote'dto the body and having means for.

3. A hand staple tacker comprising a body, a handle pivoted to the body,a-staple magazine within said body, a plunger slidably mountedwithinsaid body, a driver blade fixed to the plunger and adapted to drivestaples from the staple magazine when the plunger descends, a

trigger pivoted to the body and having means forraising the plunger,spring means to cause the plunger to descend when the trigger isreleased, means including a pawl carried by the handle and releasablyengaging the trigger for pivotally moving the trigger to raise theplunger when the handle is rotated about its pivot toward said body,said trigger having a curved projection engageable by the pawl, saidpawl being adapted to slid off said projection when said trigger reachesa predetermined angular position to release said trigger, spring meansfor urging the pawl into engagement with said trigger, and means on thetrigger to move said pawl off said projection when said trigger isrotated to a predetermined angular position, said plunger comprising amember having forwardly converging detents, and said trigger having ahead engageable between said detents.

4. A hand staple tacker comprising a body, a handle pivoted to the body,a staple magazine within said body, a plunger slidably mounted withinsaid body, a driver blade fixed to the plunger and adapted todrivestaples from the staple magazine when the plunger descends, a

raising the plunger, spring means to cause the plunger to descend when"the trigger is released, means including a pawl carried by the handleand 'releasably engaging the trigger for pivotally moving the trigger toraise the plunger when the handle is rotated about its fpivot towardsaid body, said trigger having a curved projection engageable by thepawl, said projection being so curved that said pawl will slide off saidprojection when said trigger reaches a predetermined angular position torelease said trigger, spring means for urging the pawl into engagementwith said trigger, mean on the trigger to move said pawl off saidprojection when said trigger is rotated to a predetermined angularposition, said plunger comprising a member having detents, said triggerhaving a head engageable between said detents, said trigger beinginclined downwardly and toward the plunger when the handle is in normalposition before it ispressed towards said body, and said trigger beinginclined upwardly and toward the plunger when the handle is pressedtoward the body to the point where the pawl slides off the projection onthe trigger.

5. A hand stapler comprising a body having side walls, and being open atthe bottom and at its front end, a front coverpivoted adjacent its upperend to the body and covering the front open end of the body, a staplemagazine within the lower open end of th body and extendinglongitudinally of the lower end of the body, means to pivot the staplemagazine adjacent its rear end to the body, and removable means tointerpivot the front cover belowits upper pivoted end, and the staplemagazine forwardly of its rear pivoted end, to the body, whereby uponremoval of said interpivot means, said front cover may swing forwardlyand upwardly about its upper pivot, and said staple magazine may swingdownwardly and rearwardly about its rear pivot.

6. A'hand stapler comprising a body having side walls, and being open atthe bottom 'and'at its front end, a front cover pivoted adjacent itsupper end to the body and covering the front open end of the body, astaple magazine within the lower open end of the body and extendinglongitudinally of the lower end of the body, means to pivot the staplemagazine adjacent its rear end to the body, and removable means tointerpivot the front cover below its upper pivoted end, and the staplemagazine forwardly of its rear pivoted end, to the body, whereby uponremoval of said interpivot means, said front cover may swing forwardlyand upwardly about its uppe'r'pivot, and said staple magazine may swingdownwardly and rearwardly about its rear pivot, a staple pusher for saidstaple magazine including -'a rod, a member adapted to press a staplestrip on the staple magazine toward the-discharge end of th magazine, aspring on said rod'for urging the staple strip-press means toward-saiddischarge end, a member fixed to the rearend-of said rod, a hook pivotedto said member, said springengaging said hook to pivotally move the hookin one direction and urg said hook into engagement with the means forpivoting the rear end of said staple magazine to said body, and a handleon said hook to pivotally move the hook in an opposite direction anddisengage the hook from said means which pivots the rear end of saidstaple magazine to said body.

7. A hand staple taoker comprising a hollow body having side walls, saidbody being open at its lower'end and at its forward end, a lower stopmember interconnecting said side walls adjacent the forward end of thebody, a top stop member interconnecting said side wallsand spaced abovethe bottom stop, a plunger slidably mounted within the body and betweensaid bottom stop and top stop, a spring interposed between th plungerand the top stop, a driver blade attached to said plunger and projectingdownwardly therefrom, a front cover at the front of said body, means toraise the plungerto compress th spring and to reelase the raised plungerso that the compressed spring will cause the plunger to descend, and ashock absorber on said bottom stop and adapted to be contacted by theplunger when the plunger descends, said plunger comprising a bottomwall, front and rear walls extending upwardly from said bottom wall, andside walls extending up: wardly from said bottom wall, a trigger pivotedto said body and having arms straddling the sides of said plunger, theside walls on said plunger each being formed with a pair of outwardlypressed projections, said arms having heads received between-saidprojections.

8. A hand staple tacker comprising a hollow body having side Wallsfsaidbody being open at its lower end and atits forward end, a lower stopmember interconnecting said side Walls adjacent the forward end of thebody, a top stop member interconnecting said side walls and spaced abovethe bottom stop. a plunger slidably mounted within the body and betweensaid bottom stop and top stop, a spring interposed between the plungerand the top stop, a driver blade attached to said plunger and projectingdownwardly therefrom, a front cover at the front of said body, means toraise the plunger to compress the spring and to release the raisedplunger so that the compressed spring will cause the plunger to descendand a shock absorber on said bottom stop and adapted to becontacted bythe plungerwhen the plunger descends, said plunger comprising a bottomwall, front and rear walls extending upwardly from said bottom wall, andside walls extending upwardly from said bottomwall, a trigger pivoted tosaid body and having arms straddling the sides of said plunger, the sidewalls on said plunger each being formed with a pair of outwardly pressedprojections, said arms having heads received between said projections,said projections on each side wall converging forwardly and said headshaving edges converging forwardly.

9. A hand staple tacker comprising a hollow body having side walls, saidbody being open at its lower endand at its forward end, a lower stopmember interconnecting said side walls adjacent the forward end of'the'body, a top stop member interconnecting said side walls and spaced abovethe bottom stop, a plunger slidably mountedwithin the body and betweensaid bottom stop and top stop, a spring interposed between the plungerand the'top stop, a I driver blade attached 'tosaid plunger andprojecting downwardly therefrom, a front cover-at 'thefront of saidbody, means to raise the plunger to compress the spring and to releasethe raised plunger so that the compressed spring will cause the plungerto descend, ashock absorber on said bottom stop and adapted to becontacted by the plungerwhen the plunger descends, said plungercomprising a bottom wall, front and rear walls extending upwardly fromsaid bottom wall, and side walls extending upwardly from said'bottoxnwall, a trigger pivoted to 'saidbody and having arms straddling thesides of said plunger, the side walls on said plunger each "being formedwith "a pair of outwardly pressed projections, said arms having headsreceived between said projections, said projections on each side wallconverging forwardly and said heads having edges converging forwardly,said trigger having a forwardly and upwardly curved wall adapted tocontact the rear of said back wall of said plunger, as said trigger isrotated.

- 10.A staple tacker comprising a body having a pair of side walls, afront wall at the front ends of said side walls, a pivot pininterconnectin said walls, a plunger slidably mounted for up and downmovement between said side walls forwardly of said pivot pin andadjacent the front wall, said plunger comprising a bottom wall,-parallel front and rear walls extending upward- 1y from the bottom wall,and parallel side walls extending upwardly from said bottom wall, saidside walls of said plunger each having a pair of outwardly pressedforwardly converging projec- I a pair of parallel downwardly projectingpawls,

said side arms having projecting curved lugs engaged by the lower endsof said pawls.

11. A staple tacker comprising a body having a pair of side walls, afront wall at the front ends of said side walls, a pivot pininterconnecting said walls, a plunger slidably mounted for up and downmovement between said side walls forwardly of said pivot pin andadjacent the front wall, said plunger comprising a bottom wall, parallelfront and rear walls extending upwardly from the bottom wall, andparallel side walls extending upwardly from said bottom wall, said sidewalls of said plunger each having a pair of outwardly pressed forwardlyconverging projections, a plunger blade fixed to the front wall of theplunger and projecting downwardly therefrom, a trigger pivoted to saidpivot pin, and comprising a bottom wall and a pair of parallel side armsextending upwardly from the bottom wall, heads at the forward ends ofsaid side arms received between the pairs of projections on said sidewalls, a handle pivoted to said body, pawl means movable with the handleand comprising a pair of parallel downwardly projecting pawls, said sidearms having projecting curved lugs engaged by the'lower ends of saidpawls, a forwardly and upwardly extending curved wall extending from thebottom wall of said trigger, and adapted to contact said rear wall ofsaid plunger as said plunger moves up and down.

' 12; A staple tacker comprising a body having a pair of side walls, afront wall at the front ends of said side walls, a pivot pininterconnect ing said walls, a plunger slidably mounted for up and downmovement between said side walls forwardly of said pivot pin andadjacent the front wall, said plunger comprising a bottom wall, parallelfront and rear walls extending upwardly from the bottom wall, andparallel side walls extending upwardly from said bottom wall, saidsidewalls of said plunger each having a pair of outwardly pressedforwardly converging projections, a plunger blade fixed to the frontwall of the plunger and projecting downwardly therefrom, a triggerpivoted to said pivot pin, and

comprising a bottom wall and a pair of parallel side arms extendingupwardly from the bottom wall, heads at the forward ends of said sidearms received between the pairs of projections on said side walls, ahandle pivoted to said body, pawl means movable with the handle andcomprising a pair of parallel downwardly projecting pawls, said sidearms having projecting curved lugs engaged by the lower ends of saidpawls, a forwardly and upwardly extending curved wall extending from thebottom wall of said trigger, and adapted to contact said rear wall ofsaid plunger as said plunger moves up and down, and a wall extendingupwardly from the rear end of the bottom wall of said trigger andbetween the side wall thereof, and adapted to push the pawls oif theextending lugs of the trigger at a predetere mined angular position inthe rotation of said trigger.

13. A staple tacker comprising a body having a pair of side walls, afront wall at the front ends of said side walls, a pivot pininterconnecting said walls, a plunger slidably mounted for up and downmovement between said side walls forwardly of said pivot pin andadjacent the front wall, said plunger comprising a bottom wall, parallelfront and rear walls extending upwardly from the bottom wall, andparallel side walls extending upwardly from said bottom wall, said sidewall of said plunger each having a pair of outwardly pressed forwardlyconvergin projections, a plunger blade fixed to the front wall of theplunger and projecting downwardly therefrom, a trigger pivoted to saidpivot pin, and comprising a bottom wall and a pair of parallel side armsextending upwardly from the bottom wall, heads at the forward ends ofsaid'side arms received between the pairs of projections on said sidewalls, a handle pivoted to said body, pawl means movable with the handleand comprising a pair of parallel downwardly projecting pawls, said sidearms having projecting curved lugs engaged by the lower ends of saidpawls, a forwardly and upwardly extending curved wall extending from thebottom wall of said trigger, and adapted to contact said rear wall ofsaid plunger as said plunger moves up and down, a wall extendingupwardly from the rear end of the bottom wall of said trigger andbetween the side walls thereof, and adapted to push the pawls off theextending lugs of the trigger at a predetermined angular position in therotation of said trigger, a staple-magazine within the bottom of thebody, including a fixed guide wall contacting the rear wall of saidplunger to guide the same in its up and down movement.

14. A staple tacker comprising a body having a pair of side walls, afront wall at the front ends of said walls, a pivot pin interconnectingsaid walls, a plunger slidably mounted for up and down movement betweensaid side walls forwardly of said pivot pin and adjacent the front wall,said plunger comprisin a bottom wall, parallel front and rear wallsextending upwardly from the bottom wall, and parallel side wallsextending upwarly from said bottom wall, said side walls of said plungereach having a pair of outwardly pressed forwardly convergingprojections, a plunger blade fixed to the front walls of the plunger andprojectin downwardly therefrom, a trigger'pivoted to said pivot pin, andcomprising a bottom wall and a pair of parallel sidearms extendingupwardly from the bottom wall, heads at the forward ends of said armsreceived between the pairs of projections on said side walls, a

51.5 handle mivotedxto said body, ,pawl'zmeans movable withithezhanclle; and comprising ;a pair of paralleldownwardlyproiectingipawls;saidisidezarms having zprojecting curved lugsengaged :by :the lower ends of said ipawls,ca,forwardlyi andupwardlyextending :curved wall extending from :the :bottom walhof :saidtrigger, and adapted to contact said rear wall :of .said rplungereassaid plunger moves up rand down, :and a .wall extending upwardly fromthe :rear :end .of :the bottom wall of said trigger :and between theside walls :thereof, and adapted itmpush the pawls on .thexextendinglugs of the trigger at. a predeterminedz-angular :position inthe'rotationof said-triggery-a'staplemesazine within the bottom of the;-body, '.includin -a fixed-guide wall contacting :the rearwall of saidplunger to :guide the same :in its up and down movement, a bottomstopbetween the side walls of the body and supported thereby anddisposed below 'thejplungen'a top stop mounted on and between the sidewalls of said body and above said plunger, and a spring, the lower endof which is received within said plungerand-contacting the bottomend ofsaidplunger and the .upperend-of said spring-engaging the under- 'sideofsaid top stop.

15. A hand staple tacker-comprising a hollow body'open at its'lower'andfront-ends, and open atthe top adjacentthe forward end of the body,a-handle pivoted at its forward end to the body one ,pivot pininterconnecting the side walls of the body, a frontcover member pivotedto the body about saidvpivot pin'and adapted to cover the front of thebody, removable means to .connect-the lower end of the front cover tosaid body whereby upon removal .of said removable means, said'frontcover maybe swun upwardly and forwardly about its upper pivot, aplungerslidably mounted for 'up anddown movement within said 'body'adjacent thefront cover,-trigger means to'raise said plunger, spring means to lowersaid plunger, pawl means movablewith the handle and-adapted to rotatesaid trigger means for raising said plunger, and a staplemagazine at thebottom end of the body and closing said bottom'end.

l6. Ahand staple tacker .comprisinga hnllow bodyiopenat its lowerandfront ends, and open at the top adjacent the forward end of the body, ahandle pivoted at its forward end to the body on a pivotpininterconnecting the side walls of the body, a front cover member pivotedto the body about said pivot pin and adapted to :cover the front'of thebody, removable means to connect the lower end of: the front covertosaid body whereby upon removal of said removable-means, said frontcover may be swung upwardly :and forwardly about its upperpivot, aplunger slidably mounted for'up and down movement within said bodyadjacent the front cover, trigger'means to raise said plunger, spring.means to lower said plunger, pawl "means movable with the handle andadapted to rotate said trigger means for raising .said plunger, a staplemagazine at the bottom'end of the body and closingsaid bottom end,springmeans on said pivot pin'forswinging the handle away from thebody,"and spring means for rotating said pawl means into engagementwithsaid trigger means.

17. Ahand staple tackercomprising a hollow bodyopen at its lower andfront ends,-and open at the top'adjacent the forward end of the body, ahandle pivoted at its forward end to the body on a pivot pininterconnectingthe sidewalls of-the body, a front cover member attachedto the body by:said;pivot pin and adapted to cover the front ofithabodyrmeans to: connect thelowerendof the front \cover to said body,a plunger slidably mounted for up anddown-movement within'saidbodyradjacent the front cover, trigger means .to raise=said plunger,spring means to lower said piungenpawl means movable with thehandlerandadapted to rotate said trigger means for raising said said plunger, :astaple magazine at the bottom-end ofthe bodyand closing said bottom'end,spring-means ,on said pivot-pin for swinging the handle-away from thebody, spring -means for rotating'said pawl meansinto engagement withsaid trigger means, and means on the trigger .to guide therplunger. inits up and down movement.

18. ,Aihand staple -.tacker-comprising a body, a handlepivcted to thebody, ,a-staple magazine within said body, a plunger slidably mountedwithin said :body, a -.driver 'blade fixed to ,the plunger and adapted:to drive staples from the staple magazine when -,the plunger descends,.a trigger pivoted to the bodyand having means for raisingmheplunger,spring 1means adapted to be compressed uponraisingthe plunger. andadapted tocause. the plunger to descend when the triggerisreleasedpawlmeans movable with the-handle and releasably engagingthe'trigger for pivotally moving the triggertoraisethe plunger when-thehandle is rotated about its pivot toward said body, and means on saidtrigger to disengage said pawl means from said triggertat a,predetermined angular position of said trigger.

19. Ahand staple tackertcomprisinga'body, a handle pivoted to the'body,-a staple magazine within said body, a plunger slidably mountedwithin said body, a driver blade fixed to the plunger and adapted-todrive staples from .the staple magazine when the plunger descends, atrigger pivoted to the body and having means for-raisingtheplungen-spring means adapted to be compressed upon raising theplunger and adapted to cause the plunger todescend when the .trigger isreleased, pawl ,means .movable with the :handle .and releasably engagingthe trigger for pivotally moving the trigger toraise-the plunger whenthe handle ,is rotated about .its pivottoward saidbody, andmeans on saidtrigger toguide said plungerfonup and. down movement as saidtriggerrotates.

r20. A hand staple tacker comprising abody, a handle @pivoted to thebody, a .staple magazine within said body, -a ,plunger slidably mountedwithin said .body, a driver blade fixed to the plunger .andadapted todrive staples from the staple magazine when the plunger descends, atrigger pivoted to the body andhaving means for raising the'plunger,spring means adapted tobe compressed upon raising the plunger andadaptedto pause theplunger todescend when the trigger is released, and pawlmeans movable with the handle and-releasablyengaging the trigger forpivotally moving the .triggerto raise the plunger when the handleis'rotated about its pivot toward said body, said trigger havingforwardly converging projections andsaid plungerhaving means atitsforward end disposed between said projections for connectingthetrigger to theplunger.

.21. Ahandstaple tacker comprising a body, ..a staple magazine withinsaidbodina plunger slidable within .said' bod-y,. a driverblade .fixedto .the plunger and. adapted. to drivestaples through the staplemagazinewhen the plunger descends, staple pushingmechanism on the magazinecomprising a. staple pusher, .a. rod extending longitudinally ofthemagazine an'dslidably engaging the pusher,

a member fixed to the rear end of the rod and carrying a pivot pin, ahook pivoted to the pivot pin, fixed means on the body engageable bysaid hook, and a spring on the rod interposed between the pusher and thehook for pressing the pusher forwardly against a staple strip on themagazine and to retain the hook in engagement with said fixed means.

22. A hand staple tacker comprising a body, a staple magazine within thebody, means to drive staples from the magazine, a staple pushermechanism on the magazine and comprising a pusher slidable within themagazine, a rod slidably engaging said pusher, a hook pivotallyconnected to the rod, fixed means on the body engageable by the hook,and a single spring means on said rod to press the pusher forwardlytowards the discharge end of the magazine and to retain the hook inengagement with said fixed means on said body.

23. A stapling device comprising a body having an open bottom, atransverse pin fixed within said body above the open bottom and adjacentthe rear end of the body, a staple magazine disposed within the body atthe open bottom and being pivoted to said transverse pin and beingswingable downwardly and rearwardly about said pin, detachable means forattaching the front end of the staple magazine to the body to locate themagazine at the bottom of the body, a staple guide fixed within saidmagazine, pusher mechanism comprising a pusher slidable on said stapleguide, a pusher rod on which said pusher is slidably mounted anddisposed longitudinally of the guide, a bracket fixed to the rear end ofthe pusher rod and having a rear downwardly extending wall and a pair ofparallel upstanding ears carrying a transverse pivot pin, a hook memberpivoted to the transverse pin on said bracket and having a hook portionengageable with the transverse pivot pin on said body.

24. A stapling device comprising a body having an open bottom, atransverse pin fixed Within said body above the open bottom and adjacentthe rear end of the body, a staple magazine disposed within the body atthe open bottom and being pivoted to said transverse pin and beingswingable downwardly and rearwardly about said pin, detachable means forattaching the front end of the staple magazine to the body to locate themagazine at the bottom of the body, a staple guide fixed within saidmagazine, pusher mechanism comprising a pusher slidable on said stapleguide, a pusher rod on which said pusher is slidably mounted anddisposed longitudinally of the guide, a bracket fixed to the rear end ofthe pusher rod and having a rear downwardly extending wall and a pair ofparallel upstanding ears carrying a transverse pivot pin, a hook memberpivoted to the transverse pin on said bracket and having a hook portionengageable with the transverse pivot pin on said body, said hook memberhaving a rear wall provided with a downward extension contacting theinner side of the rear wall of said bracket, and a coil compressionsprin on said rod and interposed between said pusher and said downwardextension.

25. A stapling device comprising a body having an open bottom, atransverse pin fixed within said body above the open bottom and adjacentthe rear end of the body, a staple magazine disposed within the body atthe open bottom and being pivoted to said transverse pin and beingswingable downwardly and rearwardly about said pin, detachable means forattaching the front end of the staple magazine to the body to locate themagazine at the bottom of the body, a stap e guide fixed within saidmagazine, pusher mechanism comprising a pusher slidable on said stapleguide, a pusher rod on which said pusher is slidably mounted anddisposed longitudinally of the guide, a bracket fixed to the rear end ofthe pusher rod and having a rear downwardly extending wall and a pair ofparallel upstanding ears carrying a transverse pivot pin, a hookmemberpivoted to the transverse pin on said bracket and having a hookportion engageable with the transverse pivot pin on said body, said hookmember having a rear wall provided with a downward extension contactingthe inner side of the rear wall of said bracket, and a coil compressionspring on said rod and interposed between said pusher and said downwardextension, said magazine having a bottom wall formed with a rear edgedisposed adjacent the rear wall of the bracket.

26. A stapling device comprising a body having an open bottom, atransverse pin fixed within said body above the open bottom and adjacentthe rear end of the body, a staple magazine disposed within the body atthe open bottom and being pivoted to said transverse pin and beingswingable downwardly and rearwardly about said pin, detachable means forattaching the front end of the staple magazine to the body to locate themagazine at the bottom of the body, a staple guide fixed within saidmagazine, pusher mechanism comprising a pusher slidable on said stapleguide, a pusher rod on which said pusher is slidably mounted anddisposed longitudinally of the guide, a bracket fixed to the rear end ofthe pusher rod and havin a rear downwardly extending wall and a pair ofparallel upstanding ears carrying a transverse pivot pin, a hook memberpivoted to the transverse pin on said bracket and having a hook portionengageable with the transverse pivot pin on said body, said hook memberhaving a rear wall provided with a downward extension contacting theinner side of the rear wall of said bracket, and a coil compressionspring on said rod and interposed between said pusher and said downwardextension, the rear wall of the hook member having an upward extensionprovided at its sides with forwardly extending wings, and said bodyhaving notches to receive said wings.

FRANK S. BOROUGHS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,415,330 Frankel May 9, 19221,671,733 Maynard May 29, 1928 1,757,812 Polzer May 6, 1930 1,983,397Polzer Dec. 4, 1934 1,990,725 Crofoot 1- Feb. 12, 1935 2,268,102 AttulzDec. 30, 1941 2,275,548 Olsen Mar. 10, 1942 2,326,540 Drantz Aug. 10,1943 2,341,530 Crosby Feb. 15, 1944 2,412,620 Kipp Dec. 17, 19462.437.039 Peterson Mar. 2. 1948

